Running OpenCPN Flatpak beta releases requires a working Flatpak installation. See https://flatpak.org/setup/ for platform-specific installation procedures.

Installing and running the beta is done from the command line. Flatpak can have multiple versions installed in parallel, so to be sure what's started it's best to also start it from the command line to make sure that the beta version is used:

$ flatpak install --user  https://flathub.org/beta-repo/appstream/org.opencpn.OpenCPN.flatpakref

$ flatpak run org.opencpn.OpenCPN//beta

Once installed, the beta version will be the default alternative and the one started when clicking on the OpenCPN desktop icon. However, if an earlier version was installed before the beta it is still available and can be started using

$ flatpak run org.opencpn.OpenCPN//stable

To start the beta from the command line:

$ flatpak run org.opencpn.OpenCPN//beta

To update the beta to latest version:

$ flatpak update org.opencpn.OpenCPN//beta

Also See Linux Devices